Which real-world scenario best exemplifies the use of a queue data structure?
Finding the shortest route between two points
Managing a list of students sorted alphabetically
Tracking the order of tasks assigned to a CPU
Storing a family tree with ancestors and descendants
In a circular queue implemented using an array of size 5, the front is at index 3, and the rear is at index 1. What happens after two dequeue operations?
The front moves to index 1, and the rear moves to index 4.
The front moves to index 0, and the rear moves to index 4.
The front moves to index 0, and the rear remains at index 1.
The queue becomes empty.
If you were to design a system to handle customer service requests arriving through various channels, with each request needing to be addressed in the order it was received, which data structure would be most appropriate?
Graph
Heap
Binary Search Tree
Queue
What happens to the elements in an array-based queue after a dequeue operation?
The dequeued element is marked as deleted but remains in the array.
The array is resized to accommodate the removal of the element.
The remaining elements are shifted one position towards the front of the array.
The 'front' pointer is adjusted to point to the next element in the queue, effectively removing the first element logically.
What is the time complexity of enqueue and dequeue operations in a well-implemented array-based queue?
It depends on the size of the array.
O(n), where n is the number of elements in the queue.
O(log n)
O(1)
In an array-based queue implementation, what happens when you dequeue from an empty queue?
The queue remains unchanged.
An underflow condition occurs.
The first element is removed.
The last element is removed.
What value does the 'isEmpty' operation on a queue return if the queue contains no elements?
True
The first element in the queue
0
-1
What is the primary difference between a queue and a stack?
Queues are linear data structures, while stacks are non-linear.
Queues use FIFO (First-In-First-Out), while stacks use LIFO (Last-In-First-Out).
Queues use LIFO (Last-In-First-Out), while stacks use FIFO (First-In-First-Out).
Queues store numbers, while stacks store characters.
When would it be more advantageous to use a linked list implementation of a queue over an array-based implementation?
When memory usage needs to be tightly controlled.
When dealing with a small, fixed number of elements.
When dynamic resizing and the potential for overflow are concerns.
When the maximum number of elements in the queue is known in advance.
How does an array-based queue handle the underflow condition?
By overwriting the existing elements.
By dynamically resizing the array.
By raising an exception or returning an error value when attempting to dequeue from an empty queue.
By using a circular array to reuse the empty spaces.